. >> reporter: good morning. it's hard to believe that the first presidential debate is on wednesday. mitt romney and president obama have been preparing day and night. with both men saying the other guy is going to do a better job. president obama and mitt romney start the week with a crucial showdown on wednesday at the first presidential debate in denver. at a rally in las vegas, president obama tried to manage the speculations. >> i know the media is speculating who is going to have the best zinger. i don't know about that. governor romney, he's a good debater. >> reporter: as both hunker down for intense practice, the polls show americans overwhelming with the election and the president lose. in a new abc news/"washington post" poll out this morning, 63% of registered voters expect president obama to win the election. that's his biggest lead so far when it comes to expectations. but looking at like hi supporters, the race is much closer. president obama leads mitt romney by two points. republican governor ch